CN110376715B - High-resolution prime lens - Google Patents

High-resolution prime lens Download PDF

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Publication number
CN110376715B
CN110376715B CN201910651212.9A CN201910651212A CN110376715B CN 110376715 B CN110376715 B CN 110376715B CN 201910651212 A CN201910651212 A CN 201910651212A CN 110376715 B CN110376715 B CN 110376715B
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lens
focal length
focal power
optical system
resolution
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CN110376715A (en
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曾振煌
林佳敏
卢盛林
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Guangdong OPT Machine Vision Co Ltd
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Guangdong OPT Machine Vision Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention belongs to the technical field of machine vision lenses, and particularly relates to a high-resolution fixed focus lens, which comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system comprises a first lens G1 with negative focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with negative focal power and a meniscus structure, a fourth lens G4 with negative focal power and a biconcave structure, a fifth lens G5 with positive focal power and a biconvex structure and a sixth lens G6 with negative focal power and a meniscus structure, which are sequentially arranged from an object side to an image. The optical system of the fixed-focus machine vision lens with the focal length of 8mm is realized, the F number of an image space is 2.8, the maximum imaging surface is phi 9mm, the resolution is high, the highest resolution can reach 230lp/mm, a small pixel chip with the focal length of 2.2 mu m can be matched, and the clear aperture can be flexibly adjusted.

Description

High-resolution prime lens
Technical Field
The invention belongs to the technical field of machine vision lenses, and particularly relates to a high-resolution fixed focus lens.
Background
In the wave of industrial automation, the machine vision system is widely applied to various industries, and in the applications of electronic manufacturing, liquid crystal display defect detection, food packaging, color selection and the like, the requirement on the resolution of imaging is higher and higher. In addition, the chip technology is advancing continuously, the pixel size is smaller and smaller, and the resolution of the lens matched with the pixel size is required to be further improved. However, the conventional fixed focus machine vision lens in China is generally insufficient in resolution, and cannot fully exert the performance of the camera when being matched with an imaging chip of a small pixel. The specific disadvantages are: the development of lenses with higher optical performance is more urgent because of large optical distortion, low resolution, bulky lens, or remote working distance.
In summary, the related art needs to be perfected.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the high-resolution fixed focus lens is provided, has higher resolution, can reach 230lp/mm at the highest resolution, and can be matched with a 2.2 mu m small pixel chip; and has low distortion and good chromatic aberration correction capability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a high-resolution fixed focus lens, includes mechanical system and install in the optical system of mechanical system inside, optical system includes that from object side to image sets gradually have negative focal power and the first lens G1 of meniscus structure, have positive focal power and the tenth lens G10 of meniscus structure, have negative focal power and the third lens G3 of meniscus structure, have negative focal power and biconcave structure's fourth lens G4, have positive focal power and biconvex structure's fifth lens G5, have negative focal power and the sixth lens G6 of meniscus structure, have positive focal power and the seventh lens G7 of biconcave structure, have negative focal power and the eighth lens G8 of biconcave structure, have positive focal power and the ninth lens G9 of biconvex structure, have positive focal power and the tenth lens G10 of biconvex structure, each lens be spherical mirror, first lens G1 with the second lens G2 glue into have positive focal power's first cemented lens group U1, have positive focal power, seventh lens G6 with the biconvex structure's fifth lens G5, have negative focal power and the eighth lens G8 of biconcave structure, have positive focal length and the eighth lens G8 U1 Focal length f of the second cemented lens group U2 Focal length f of the third cemented lens group U3 The following relations are satisfied: 2.5<|f U1 /f|<4.5，2.0<|f U2 /f|<4.0，500<|f U3 /f|<1000。
As an improvement of the high-resolution fixed-focus lens of the present invention, a distance L from a front surface vertex of the first lens G1 to a rear surface vertex of the tenth lens G10 and a focal length f of the optical system satisfy the following relation: l/f 1.5.
As an improvement of the high-resolution fixed focus lens of the present invention, the optical back intercept BFL of the optical system and the focal length f of the optical system satisfy the following relation: BFL/f I >1.2.
As an improvement of the high-resolution fixed-focus lens of the present invention, the half image height y' of the optical system and the focal length f of the optical system satisfy the following relation: y'/f < 0.65.
As an improvement of the high-resolution fixed-focus lens of the invention, the focal length of the first lens G1 is f G1 The focal length of the second lens G2 is f G2 Focal length f G2 And focal length f U1 The ratios of (2) satisfy the relation: 0.5 < |f G1 /f U1 |＜0.85；0.25＜|f G2 /f U1 |＜0.5。
As an improvement of the high-resolution fixed focus lens of the present invention, the refractive index of the third lens G3 is n3, which satisfies the following relation: n3 is more than 1.65 and less than 1.80; the refractive index of the fourth lens G4 is n4, which satisfies the relation: n4 is more than 1.55 and less than 1.65; the refractive index of the fifth lens G5 is n5, which satisfies the relation: n5 is more than 1.85 and less than 1.95.
As an improvement of the high-resolution fixed-focus lens of the present invention, the focal length of the sixth lens G6 is f G6 The focal length of the seventh lens G7 is f G7 Its focal length f G6 And focal length f U2 Ratio of (f), focal length f G7 And focal length f U2 The ratio of (2) satisfies the relationship: 0.85 < |f G6 /f U2 |＜1.2；0.3＜|f G7 /f U2 |＜0.6。
As an improvement of the high-resolution fixed-focus lens of the invention, the focal length of the eighth lens G8 is f G8 The focal length of the ninth lens G9 is f G9 Its focal length f G8 And f G9 The ratio of (2) satisfies the relation: 0.85 < |f G8 /f G9 |＜1.20。
As an improvement of the high-resolution fixed-focus lens of the present invention, the refractive index of the tenth lens G10 is n10, which satisfies the following relation: n10 is more than 1.75 and less than 1.85.
As an improvement of the high-resolution fixed focus lens, the invention further comprises a diaphragm, wherein the diaphragm is arranged between the fifth lens G5 and the sixth lens G6, the aperture of the diaphragm is a round hole, and the aperture of the diaphragm is adjustable within the range of F2.8-F16.
The invention has the beneficial effects that: the optical system of the fixed-focus machine vision lens with the focal length of 8mm is realized through the structure, the F number of an image space is 2.8, the maximum imaging surface is phi 9mm, the resolution is high, the highest resolution can reach 230lp/mm, a small pixel chip with the size of 2.2 mu m can be matched, when the corresponding chip is 1/1.8', the pixel can reach eight million pixels, and the maximum optical distortion of the whole field of view is lower than 0.5%; the whole group of focusing modes are adopted, and the clear aperture can be flexibly adjusted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a structure in an embodiment of the present invention;
FIG. 2 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 3 is a graph of distortion of an optical system in an embodiment of the invention;
wherein: 0-an optical system; g1-a first lens; g2—a second lens; g3—a third lens; g4—fourth lens; g5—fifth lens; g6—sixth lens; g7-seventh lens; g8-eighth lens; g9—ninth lens; g10—tenth lens; 11-diaphragm; u1-a first cemented lens; u2-a second cemented lens; u3-a third cemented lens; distance from front surface vertex of L-first lens to rear surface vertex of tenth lens; optical back intercept of BFL-optical system.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention will be described in further detail below with reference to the drawings, but is not limited thereto.
1-2, a high-resolution fixed-focus lens comprises a mechanical system and an optical system 0 installed in the mechanical system, wherein the optical system 0 comprises a first lens with negative focal power and a meniscus structure sequentially arranged from an object side to an image sideThe lens G1, the second lens G2 having positive power and a meniscus structure, the third lens G3 having negative power and a meniscus structure, the fourth lens G4 having negative power and a biconcave structure, the fifth lens G5 having positive power and a biconcave structure, the sixth lens G6 having negative power and a meniscus structure, the seventh lens G7 having positive power and a biconcave structure, the eighth lens G8 having negative power and a biconcave structure, the ninth lens G9 having positive power and a biconcave structure, the tenth lens G10 having positive power and a biconcave structure, are spherical lenses, the first lens G1 and the second lens G2 are cemented into a first cemented lens group U1 having positive power, the sixth lens G6 and the seventh lens G7 are cemented into a second cemented lens group U2 having positive power, the eighth lens G8 and the ninth lens G9 are cemented into a third lens group U3 having negative power, the focal length f of the cemented optical system 0, and the focal length f of the cemented optical system U1 Focal length f of second cemented lens group U2 Focal length f of third cemented lens group U3 The following relations are satisfied: 2.5<|f U1 /f|<4.5，2.0<|f U2 /f|<4.0，500<|f U3 /f|<1000。
Preferably, the distance L from the front surface vertex of the first lens G1 to the rear surface vertex of the tenth lens G10 and the focal length f of the optical system 0 satisfy the relationship: l/f 1.5.
Preferably, the optical back intercept BFL of the optical system 0 and the focal length f of the optical system 0 satisfy the relation: BFL/f I >1.2.
Preferably, the half image height y' of the optical system 0 and the focal length f of the optical system 0 satisfy the relationship: y'/f < 0.65.
Preferably, the focal length of the first lens G1 is f G1 The focal length of the second lens G2 is f G2 Focal length f G2 And focal length f U1 The ratios of (2) satisfy the relation: 0.5 < |f G1 /f U1 |＜0.85；0.25＜|f G2 /f U1 |＜0.5。
Preferably, the refractive index of the third lens G3 is n3, satisfying the relation: n3 is more than 1.65 and less than 1.80; the refractive index of the fourth lens G4 is n4, satisfying the relation: n4 is more than 1.55 and less than 1.65; the refractive index of the fifth lens G5 is n5, satisfying the relation: n5 is more than 1.85 and less than 1.95.
Preferably, the focal length of the sixth lens G6 is f G6 The focal length of the seventh lens G7 is f G7 Its focal length f G6 And focal length f U2 Ratio of (f), focal length f G7 And focal length f U2 The ratio of (2) satisfies the relationship: 0.85 < |f G6 /f U2 |＜1.2；0.3＜|f G7 /f U2 |＜0.6。
Preferably, the focal length of the eighth lens G8 is f G8 The focal length of the ninth lens G9 is f G9 Its focal length f G8 And f G9 The ratio of (2) satisfies the relation: 0.85 < |f G8 /f G9 |＜1.20。
Preferably, the refractive index of the tenth lens G10 is n10, satisfying the relation: n10 is more than 1.75 and less than 1.85.
The invention also comprises a diaphragm 11, wherein the diaphragm 11 is arranged between the fifth lens G5 and the sixth lens G6, the aperture of the diaphragm 11 is a round hole, and the aperture of the diaphragm 11 is adjustable within the range of F2.8-F16.
In this example, the optical system 0 data is as follows:
in this example, the focal length F of the optical system 0 is 8mm, the maximum aperture is f# =2.8, and the focal length F of the first cemented lens group U1 The focal length f of the second cemented lens group = 29.42mm U2 =24.95 mm, focal length f of third cemented lens group U3 6987.69mm, the distance l=33.3 mm from the front surface vertex of the first lens G1 to the rear surface vertex of the tenth lens G10, the optical rear intercept bfl=12.6 mm, the half image height y' =4.5 mm, the focal length f of the first lens G1 G1 = -23.42mm, focal length f of second lens G2 G2 =12.47 mm, focal length f of sixth lens G6 G6 -25.03mm, focal length f of seventh lens G7 G7 =12.90 mm, focal length f of eighth lens G8 G8 = -14.47mm, focal length f of ninth lens G9 G9 ＝15.39mm。
Each relationship ofThe formula: i f U1 /f|＝3.67；|f U2 /f|＝3.11；|f U3 /f|＝873.46；
|L/f|＝4.16；|BFL/f|＝1.57；|y’/f|＝0.56；|f G1 /f U1 |＝0.79；
|f G2 /f U1 |＝0.42；|f G6 /f U2 |＝1.00；|f G7 /f U2 |＝0.51；
|f G8 /f G9 |＝0.94
The relation is satisfied:
2.5<|f U1 /f|<4.5；2.0<|f U2 /f|<4.0；500<|f U3 /f|<1000；
|L/f|>1.5；|BFL/f|>1.2；|y’/f|＜0.65；0.5＜|f G1 /f U1 |＜0.85；
0.25＜|f G2 /f U1 |＜0.5；0.85＜|f G6 /f U2 |＜1.2；
0.3＜|f G7 /f U2 |＜0.6；0.85＜|f G8 /f G9 |＜1.20。
FIG. 3 is a graph showing the optical distortion of the present embodiment, wherein the maximum optical distortion is less than 0.5% over the full field of view;
through the structure, the optical system 0 of the line scanning machine vision lens with the focal length of 8mm is realized, the F number of an image space is 2.8, and the maximum imaging surface isThe resolution is high, the highest resolution can reach 230lp/mm, a 2.2 mu m small pixel chip can be matched, the pixel can reach eight million pixels when the corresponding 1/1.8' chip is provided, and the maximum optical distortion of the full view field is lower than 0.5%; the whole group of focusing modes are adopted, and the clear aperture can be flexibly adjusted.
While the foregoing description illustrates and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.

Claims (10)

1. A high-resolution fixed focus lens is characterized in that: the optical system (0) comprises a mechanical system and an optical system (0) arranged in the mechanical system, wherein the optical system (0) comprises a first lens G1 with negative focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with negative focal power and a meniscus structure, a fourth lens G4 with negative focal power and a biconcave structure, a fifth lens G5 with positive focal power and a biconvex structure, a sixth lens G6 with negative focal power and a meniscus structure, a seventh lens G7 with positive focal power and a biconvex structure, an eighth lens G8 with negative focal power and a biconcave structure, a ninth lens G9 with positive focal power and a biconvex structure, a tenth lens G10 with positive focal power and a biconvex structure, all of which are spherical lenses, the first lens G1 and the second lens G2 form a first cemented lens group U1 with positive focal power, the sixth lens G6 and the seventh lens G7 with positive focal power and the eighth lens G8 with positive focal power, and the eighth lens F8 with positive focal power and the eighth lens G2 are cemented lens G8 with positive focal power U1 Focal length f of the second cemented lens group U2 Focal length f of the third cemented lens group U3 The following relations are satisfied: 2.5<|f U1 /f|<4.5，2.0<|f U2 /f|<4.0，500<|f U3 /f|<1000。
2. The high-resolution fixed focus lens as claimed in claim 1, wherein a distance L from a front surface vertex of the first lens G1 to a rear surface vertex of the tenth lens G10 and a focal length f of the optical system (0) satisfy the relationship: l/f 1.5.
3. The high resolution fixed focus lens as claimed in claim 1, wherein an optical back intercept BFL of the optical system (0) and a focal length f of the optical system (0) satisfy the relation: BFL/f I >1.2.
4. The high-resolution fixed focus lens as claimed in claim 1, wherein a half image height y' of the optical system (0) and a focal length f of the optical system (0) satisfy the relation: y'/f < 0.65.
5. The high-resolution fixed focus lens as claimed in claim 1, wherein a focal length of said first lens G1 is f G1 The focal length of the second lens G2 is f G2 Focal length f G2 And focal length f U1 The ratios of (2) satisfy the relation: 0.5 < |f G1 /f U1 |＜0.85；0.25＜|f G2 /f U1 |＜0.5。
6. The high-resolution fixed focus lens as claimed in claim 1, wherein the refractive index of the third lens G3 is n3, satisfying the relation: n3 is more than 1.65 and less than 1.80; the refractive index of the fourth lens G4 is n4, which satisfies the relation: n4 is more than 1.55 and less than 1.65; the refractive index of the fifth lens G5 is n5, which satisfies the relation: n5 is more than 1.85 and less than 1.95.
7. The high-resolution fixed focus lens as claimed in claim 1, wherein a focal length of said sixth lens G6 is f G6 The focal length of the seventh lens G7 is f G7 Its focal length f G6 And focal length f U2 Ratio of (f), focal length f G7 And focal length f U2 The ratio of (2) satisfies the relationship: 0.85 < |f G6 /f U2 |＜1.2；0.3＜|f G7 /f U2 |＜0.6。
8. The high-resolution fixed focus lens as claimed in claim 1, wherein a focal length of said eighth lens G8 is f G8 The focal length of the ninth lens G9 is f G9 Its focal length f G8 And f G9 The ratio of (2) satisfies the relation: 0.85 < |f G8 /f G9 |＜1.20。
9. The high resolution fixed focus lens as claimed in claim 1, wherein the refractive index of said tenth lens G10 is n10, satisfying the relation: n10 is more than 1.75 and less than 1.85.
10. The high-resolution fixed focus lens as claimed in claim 1, further comprising a diaphragm (11), wherein the diaphragm (11) is disposed between the fifth lens G5 and the sixth lens G6, the aperture of the diaphragm (11) is a circular aperture, and the aperture of the diaphragm (11) is adjustable in the range of F2.8-F16.
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